- Elgin, Knowles & Senne, Inc Elgin, Knowles & Senne, Inc. is a consulting surveying company that offers professional services including: surveying software, celestial observations, GPS surveying, surveying education, expert witness testimony, seminars on surveying subjects, surveying continuing education, boundary surveying, ALTA/ASCM surveys, state plane coordinates, ephemeris data and forensic ...www.rollanet.org/~eksi